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                Shopping                </h1>
                <p>时间限制：30s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><p>马上就是小苗的生日了，为了给小苗准备礼物，小葱兴冲冲地来到了商店街。商店街有n个商店，并且它们之间的道路构成了一颗树的形状。</p>
<div>第i个商店只卖第i种物品，小苗对于这种物品的喜爱度是wi，物品的价格为ci，物品的库存是di。但是商店街有一项奇怪的规定：如果在商店u,v买了东西，并且有一个商店w在u到v的路径上，那么必须要在商店w买东西。小葱身上有m元钱，他想要尽量让小苗开心，所以他希望最大化小苗对买</div>
<div>到物品的喜爱度之和。这种小问题对于小葱来说当然不在话下，但是他的身边没有电脑，于是他打电话给同为OI选手的你，你能帮帮他吗？</div>
<div></div></p><hr/><h3>输入格式</h3><p><p>输入第一行一个正整数T，表示测试数据组数。</p>
<div>对于每组数据，</div>
<div>第一行两个正整数n;m；</div>
<div>第二行n个非负整数w1,w2...wn；</div>
<div>第三行n个正整数c1,c2...cn；</div>
<div>第四行n个正整数d1,d2...dn；</div>
<div>接下来n-1行每行两个正整数u;v表示u和v之间有一条道路</div>
<div></div></p><hr/><h3>输出格式</h3><p><div>输出共T 行，每行一个整数，表示最大的喜爱度之和。</div>
<div></div></p><hr/><h3>样例输入</h3><pre>1 
3 2
1 2 3
1 1 1
1 2 1
1 2
1 3</pre><hr/><h3>样例输出</h3><pre>4</pre><hr/><h3>提示</h3><p><p>&nbsp;N&lt;=500,M&lt;=4000,T&lt;=5,Wi&lt;=4000,Di&lt;=100</p></p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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